echinoderm

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Images & Videos

examine a variety of echinoderm species such as starfish, basket star, sand dollar, and sea cucumber

firebrick starfish

high Arctic sea star

giant purple sea urchin

Observe sea star reproduction, from egg and sperm release and fertilization to development of zooplankton embryos and larvae

watch a starfish's tube feet pry open a mussel's shell and extrude its stomach onto the mussel

sunflower starfish

California sea cucumbers

For Students

giant purple sea urchin

echinoderm summary

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In this aerial photo, structures are damaged and destroyed October 15, 2005 in Balakot, Pakistan. It is estimated that 90% of the city of Balakot was leveled by the earthquake. The death toll in the 7.6 magnitude earthquake that struck northern Pakistan on October 8, 2005 is believed to be 38,000 with at least 1,300 more dead in Indian Kashmir. SEE CONTENT NOTES.

6 of the World’s Deadliest Natural Disasters

earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

The 6 Deadliest Earthquakes Since 1950

The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

The Lost Colony of Roanoke

January 21, 2019: Superbowl LIII will be played at Atlanta's Mercedes-Benz Stadium on Sunday, February 3, 2019 against the New England Patriots and the Los Angeles Rams.

What Was the Super Bowl’s First Blockbuster Commercial?

Data analysis of the Super Bowl's "winningest" teams, game locations, MVP winners by position, teams with the most game losses. football, sports, infographic

From Sport to Spectacle: The History of the Super Bowl

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Remarkable new details of Pluto's largest moon Charon are revealed in this image from New Horizons' Long Range Reconnaissance Imager (LORRI), taken late on July 13, 2015 from a distance of 289,000 miles

Why Is Pluto No Longer a Planet?

echinoderm: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	Echinodermata

Photos and Videos

firebrick starfish

high Arctic sea star

giant purple sea urchin

sunflower starfish

California sea cucumbers

examine a variety of echinoderm species such as starfish, basket star, sand dollar, and sea cucumber

Observe sea star reproduction, from egg and sperm release and fertilization to development of zooplankton embryos and larvae

watch a starfish's tube feet pry open a mussel's shell and extrude its stomach onto the mussel

See All Videos and Images →

Topics

carpoid Echinozoa Blastozoa Asterozoa Crinozoa sea star sea cucumber brittle star blastoid crinoid annelid crustacean sponge flatworm cnidarian arthropod mollusk moss animal lamp shells chordate

Dig Deeper: More Articles That Discuss This Topic

Key People

Alexander Agassiz

Alexander Agassiz

Swiss scientist

Quiz

Lion (panthera leo)

Deadliest Animals Quiz

vulture. An adult bearded vulture at a raptor recovery center. The Gypaetus barbatus also known as the Lammergeier or Lammergeyer, is a bird of prey and considered an Old World vulture.

Animal Factoids

Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters

Animal Group Names

Mute swan with cygnet. (birds)

Match the Baby Animal to Its Mama Quiz